Ranking Score Explained

Hi there, thanks for your interest in how we calculate an experience's ranking score. It's at the core of Rankers so I'm pleased you're curious.

The ranking score percentage is used to compare and sort experiences in ranking tables. It is not necessarily a direct measurement of the quality of a particular experience as rated by its customers. I've found it a useful tool to allow me to find the best experiences with confidence. But I've also found it important to read the customer reviews before making any final judgements!

We calculate an experience's ranking score using a multi-factor data model instead of a raw data average (mean). This model takes into account several important questions. For instance - is there a trusted body of reviews? What is the age of a review and is the review from a credible source?

Below you'll find details around some of the important factors that went into calculating the ranking score for Waitomo Glowworm Caves.

If you have any questions or comments about our ranking score calculation please get in touch at info@rankers.co.nz. We don't believe this is perfect or complete so we're always interested in ways we might make improvements.

Nick Morrison's avatar

Nick Morrison

Rankers owner

Waitomo Glowworm Caves

Valid Reviews

288 Valid Reviews

The Waitomo Glowworm Caves experience has a total of 289 reviews. There are 288 valid reviews that are included when calculating the ranking score and 1 invalid review that are excluded from the calculation. Reviews can be excluded only when a reviewer is not verified or after an investigation by our team determines the reviewer is not genuine.

Below is the distribution of ratings for the 288 valid reviews:

Rating Count Percentage
10/10 36
13%
9/10 52
18%
8/10 81
28%
7/10 64
22%
6/10 22
8%
5/10 13
5%
4/10 8
3%
3/10 5
2%
2/10 4
1%
1/10 3
1%

75.66% Average

The raw data average (mean) for all the Waitomo Glowworm Caves valid reviews is 75.66% and is based on 288 valid reviews. This value is not used to calculate the ranking score and it only provided here as a comparison to the weighted average.

Face-to-Face Reviews

263 Face-to-Face Reviews

The Rankers team meets with travellers while they’re in New Zealand and conducts face-to-face surveys. These reviews, in our opinion, are the most trusted in the industry and represent a critical control sample. To our knowledge, we are the only travel review website in the world that has gone to this extent.

More about face-to-face reviews

Within the 288 valid reviews, the experience has 263 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 263 face-to-face reviews:

Rating Count Percentage
10/10 29
11%
9/10 49
19%
8/10 76
29%
7/10 57
22%
6/10 21
8%
5/10 13
5%
4/10 7
3%
3/10 5
2%
2/10 4
2%
1/10 2
1%

75.36% Average

The raw data average (mean) for all the Waitomo Glowworm Caves face-to-face reviews is 75.36% and is based on 263 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.

Weighted Average

75.35%

Rankers calculates a weighted mean as a base average on which we can improve. Individual review's ratings are given a weight based on several factors. The weight of a review determines the overall impact it'll have on the final weighted average.

Recent reviews have more weight as they are more relevant and reflect the experience as it currently operates. Over time reviews become less relevant and loose their impact on the ranking score.

Low rating reviews carry slightly less weight. This dampens the effect of very low ratings for every experience across the board. This is especially important when the experience has few reviews overall and a single negative rating can grossly mischaracterise an experience. Consistent poor reviews will still result in the experience receiving a comparitively low ranking score.

Credible sources provide reviews that can be trusted. If we have verified a reviewer is genuine via a face-to-face meeting then the review carries additional weight.

Reviewer Rating Age Face-to-Face Weight Relative Weight
ros fraser 4/10 937 days 7.08 100%
wynden 1/10 965 days 5.6 79%
Rado Hank 10/10 1052 days true 5.29 75%
Lizzie Edmonds 8/10 1053 days true 5.02 71%
Anis Quentin 7/10 1060 days true 4.73 67%
Jeny Smolders 7/10 1064 days true 4.69 66%
Oscar Petersen 8/10 1071 days true 4.84 68%
Ani 9/10 1180 days 4.83 68%
Martin Murlik 8/10 1292 days true 4.38 62%
Laura 9/10 1303 days true 4.59 65%
Melanie Farrell 7/10 1311 days true 4.17 59%
Andy 10/10 1318 days true 4.56 65%
Julia Achatz 5/10 1332 days true 3.67 52%
Auba Mateos 7/10 1338 days true 4.12 58%
Charlotte 7/10 1338 days 4.12 58%
Isabel Zedelius 8/10 1341 days true 4.29 61%
Dries 8/10 1381 days true 4.22 60%
Clarissa Glaser 8/10 1382 days true 4.22 60%
Alna 10/10 1387 days true 4.43 63%
Holger Worner 9/10 1387 days true 4.43 63%
Karlee Hormell 9/10 1396 days true 4.41 62%
Alonso 9/10 1400 days true 4.4 62%
Rose Guillaume 8/10 1403 days true 4.18 59%
Caroline Coudray 8/10 1407 days true 4.17 59%
Barbara 8/10 1407 days true 4.17 59%
Leonie Brabers 7/10 1415 days true 3.98 56%
Bina Johansson 10/10 1415 days true 4.37 62%
Sam Staines 9/10 1419 days true 4.37 62%
Erik 6/10 1422 days true 3.62 51%
Nicole Signer 8/10 1429 days true 4.13 58%
Sam Taylor 7/10 1433 days true 3.95 56%
Vanuxem 8/10 1637 days true 3.74 53%
Clara Bertomeu 10/10 1637 days 3.94 56%
Lukas Boller 9/10 1639 days true 3.94 56%
Mette Elholm 7/10 1653 days true 3.56 50%
Mathilde Arp 8/10 1653 days true 3.71 52%
Chloe and Guillame 9/10 1657 days true 3.9 55%
Andre 9/10 1659 days true 3.9 55%
Doerte 10/10 1659 days true 3.9 55%
Saskia Peek 9/10 1660 days true 3.89 55%
Erika Tarant 8/10 1660 days true 3.7 52%
Jennifer Nguyen 7/10 1661 days true 3.54 50%
Julie Duvert 7/10 1661 days true 3.54 50%
Dan Ramsl 4/10 1661 days true 3.07 43%
Lucy Mulvin 7/10 1662 days true 3.54 50%
Fine Kochling 9/10 1664 days true 3.89 55%
Eberhard 9/10 1664 days true 3.89 55%
Hannes 8/10 1665 days true 3.69 52%
Calum Penn 9/10 1667 days true 3.88 55%
Arthur Portolleau 6/10 1668 days true 3.22 46%
Elisabet 10/10 1669 days true 3.88 55%
Tommy Mannien 8/10 1670 days true 3.68 52%
Solange Bourbeois 8/10 1673 days true 3.68 52%
Talissa Missiato 10/10 1673 days true 3.87 55%
Severin Knegsch 9/10 1674 days true 3.87 55%
Pierre Jouffineau 10/10 1675 days true 3.86 55%
Lewis Whittle 8/10 1677 days true 3.67 52%
Ben and Pauline 8/10 1679 days true 3.66 52%
Ann-Kathrin 7/10 1684 days true 3.5 49%
Natasha Harbinson 10/10 1685 days true 3.85 54%
Sebastian 2/10 1686 days true 2.88 41%
Jaquein Bucholz 3/10 1686 days true 2.96 42%
Chiara 7/10 1686 days true 3.5 49%
Cariotta Kemper 3/10 1686 days true 2.96 42%
Megan Lenox 7/10 1689 days true 3.49 49%
Max Mustermann 8/10 1691 days true 3.64 51%
Amy Stafford 8/10 1694 days true 3.64 51%
Carl 7/10 1694 days true 3.48 49%
Briony 7/10 1696 days true 3.48 49%
Melanie Kronbichler 8/10 1697 days true 3.63 51%
Andreas Schiefer 7/10 1698 days true 3.48 49%
Veronique Kaplan 3/10 1700 days true 2.94 42%
Robin Ings 6/10 1701 days true 3.17 45%
Stula Vladimir 7/10 1702 days true 3.47 49%
David Soukal 8/10 1702 days true 3.62 51%
Olivia Aliprandi 7/10 1703 days true 3.47 49%
Isabelle 2/10 1705 days true 2.85 40%
Jonathan Gourmel 8/10 1705 days true 3.62 51%
Mikkel Palleson 4/10 1708 days true 3.0 42%
Franziska and Sabine 7/10 1709 days true 3.46 49%
Chloe Guerillot 7/10 1709 days true 3.46 49%
Faye Oliver 7/10 1711 days true 3.45 49%
Iris Kerbler 9/10 1711 days true 3.79 54%
Til Schaebitz 6/10 1712 days true 3.15 44%
Elisabeth Grabner 9/10 1714 days true 3.79 54%
Berith 10/10 1714 days true 3.79 54%
Chris Simpson 6/10 1717 days true 3.14 44%
Pekka and Jonna 9/10 1717 days true 3.78 53%
Jonas Hoerning 8/10 1718 days true 3.59 51%
Nils 10/10 1718 days true 3.78 53%
Mark Rosema 8/10 1719 days true 3.59 51%
Lisa Huber 10/10 1719 days true 3.78 53%
Nicola Wiggan 9/10 1740 days true 3.74 53%
Linda and Gunther 4/10 1741 days true 2.95 42%
Julie 9/10 1742 days true 3.73 53%
Maria Schaer 7/10 1746 days 3.39 48%
Mette and Jesper 5/10 1748 days true 3.01 43%
Pierre and Alexandra 6/10 1754 days true 3.08 44%
Julia Waenninger 8/10 1766 days 3.5 50%
Sarah Boettcher 9/10 1802 days true 3.62 51%
Suzanne Vermeulen 6/10 1819 days 2.97 42%
Blandine Giusti 7/10 2022 days true 2.9 41%
Bart Hanssen 6/10 2101 days true 2.52 36%
Astrid Egesten 7/10 2153 days 2.67 38%
Jean Curry 9/10 2376 days true 2.49 35%
Carla Oyarzun 1/10 2380 days true 1.81 26%
Philippe Chiasson 9/10 2386 days true 2.47 35%
Helma Druyken 4/10 2396 days true 1.94 27%
Florian Guttler 7/10 2399 days true 2.23 31%
Casandra Prunica 8/10 2400 days true 2.32 33%
Lauren Hedley 7/10 2400 days true 2.23 31%
Janina Zwerver 8/10 2400 days true 2.32 33%
Marieke Feyteres 4/10 2404 days true 1.93 27%
van Linda Werner 5/10 2404 days true 1.98 28%
Philip Donachie 7/10 2414 days true 2.2 31%
Luisa Bach 8/10 2414 days true 2.3 32%
Kristina 7/10 2416 days true 2.2 31%
Eugen Lehner 6/10 2417 days true 2.0 28%
Manuel Bach 7/10 2417 days true 2.2 31%
Matthias Freiling 2/10 2424 days true 1.8 25%
Debora Grusler 6/10 2427 days true 1.99 28%
Andreas Brodhaeker 8/10 2440 days true 2.25 32%
Renee van der Syde 7/10 2441 days true 2.15 30%
Martha Horst 8/10 2441 days true 2.25 32%
Roland Beer 7/10 2445 days true 2.15 30%
Johanna Bak 4/10 2445 days true 1.86 26%
Lior Bakski 9/10 2455 days true 2.34 33%
Bet 9/10 2456 days true 2.34 33%
Memain 8/10 2729 days true 1.71 24%
Konza 7/10 2730 days true 1.64 23%
Steen Rausmussen 8/10 2761 days true 1.65 23%
David Restell 10/10 2791 days 1.68 24%
Christina Rodewald 9/10 2796 days true 1.67 24%
Hanneke P 7/10 2822 days 1.47 21%
Kohler 9/10 2842 days true 1.58 22%
Alexandra van den Brack 6/10 2850 days true 1.3 18%
Paul Lawrence 9/10 2851 days true 1.56 22%
Abby Rushmer 7/10 2852 days true 1.42 20%
Stephan Olivier 7/10 2857 days true 1.41 20%
Stephan Olivier 7/10 2857 days true 1.41 20%
Faassen 8/10 2861 days true 1.47 21%
Julie Lamart 8/10 2862 days true 1.46 21%
Adrian Weidell 5/10 3058 days true 0.94 13%
Jonathan Tuthill 9/10 3113 days true 1.05 15%
A Ormsby 10/10 3125 days true 1.03 15%
Gillian Rowe 10/10 3138 days true 1.0 14%
Ryan Pynappels 8/10 3139 days true 0.95 13%
Peter Dellen 8/10 3140 days true 0.95 13%
Jorg Steffens 8/10 3140 days true 0.95 13%
Danielle & Jobbe 9/10 3142 days true 0.99 14%
Christina 6/10 3143 days true 0.82 12%
Jop Veldhuis 7/10 3143 days true 0.9 13%
Paul Weidenfeld 8/10 3144 days true 0.94 13%
Sophie Dorrepaal 7/10 3144 days true 0.9 13%
Fannette Peyreplane 5/10 3145 days true 0.8 11%
Norm Cooper 7/10 3149 days true 0.89 13%
Gloria, Rose & An 8/10 3149 days true 0.93 13%
A Sorg 10/10 3149 days true 0.98 14%
Samplonius 5/10 3152 days true 0.79 11%
Petra 10/10 3152 days true 0.97 14%
Bethany Hamilton 8/10 3156 days true 0.92 13%
suffolkhouse69 9/10 3157 days 0.96 14%
a a 8/10 3188 days 0.86 12%
Julia Balionis 7/10 3202 days true 0.8 11%
Julia Hartman 3/10 3203 days true 0.67 10%
Fabienne Indergand 7/10 3223 days true 0.76 11%
Waldemar Schuler 9/10 3235 days true 0.81 11%
pepette31 7/10 3310 days 0.61 9%
Craig Hathaway 9/10 3462 days true 0.37 5%
Stephane Lebel 9/10 3467 days true 0.36 5%
Rens Hemselmans 7/10 3480 days true 0.3 4%
Isabell 10/10 3482 days true 0.33 5%
Holly Cave 5/10 3482 days true 0.27 4%
J Palmer 6/10 3486 days true 0.27 4%
Liz & Jim 10/10 3488 days true 0.32 4%
Edgar & Marilyn Berry 9/10 3490 days true 0.31 4%
Simon Vickers 2/10 3493 days true 0.23 3%
Leslie 8/10 3506 days true 0.27 4%
Jean-Francois Guilbault 8/10 3507 days true 0.27 4%
Selina Mueller 7/10 3508 days true 0.25 4%
Tamlin Barton 3/10 3509 days true 0.21 3%
Cara Dungay 8/10 3510 days true 0.26 4%
Bottcher 10/10 3510 days true 0.27 4%
Alexandra 10/10 3511 days true 0.27 4%
Philipp Rau 7/10 3513 days true 0.24 3%
Dan Aldridge 9/10 3515 days true 0.26 4%
John Allen 8/10 3517 days true 0.25 3%
Curtis Penner 8/10 3517 days true 0.25 3%
Brandt 8/10 3519 days true 0.24 3%
Nadia Husain 5/10 3522 days true 0.2 3%
T J Andrews 6/10 3538 days true 0.18 3%
Charli Skinner 7/10 3789 days true 0.0 0%
Carl_Larsen 10/10 3798 days 0.0 0%
Susan & Richard 10/10 3859 days 0.0 0%
Rik 9/10 3860 days true 0.0 0%
Jonathan Martin 7/10 3862 days true 0.0 0%
Gunda G 9/10 3867 days true 0.0 0%
Aaron 8/10 3869 days true 0.0 0%
Will Jemma 6/10 3872 days true 0.0 0%
Christen Hans 10/10 3873 days true 0.0 0%
Monica and Danie. 7/10 3881 days true 0.0 0%
Stephen 5/10 3883 days true 0.0 0%
Susan 10/10 3883 days true 0.0 0%
snodge 8/10 3887 days 0.0 0%
Bo Moenstead 9/10 3896 days true 0.0 0%
Alain Deslandres 8/10 3900 days true 0.0 0%
Jakob Jurgen 10/10 3901 days true 0.0 0%
EA Anders 8/10 3904 days true 0.0 0%
Helen and Hans Walser 1/10 3907 days true 0.0 0%
kevinp 8/10 3930 days true 0.0 0%
warrenp 9/10 3934 days true 0.0 0%
braunweiler 9/10 3938 days true 0.0 0%
pimn 9/10 3943 days true 0.0 0%
asiacritics 7/10 3949 days 0.0 0%
Chris Mackamul 8/10 3956 days true 0.0 0%
Debbie Rathbone 10/10 3956 days true 0.0 0%
Lisette X 9/10 3957 days true 0.0 0%
Martin 10/10 3959 days true 0.0 0%
Thomas Willi 10/10 3959 days true 0.0 0%
Elodie 7/10 3960 days true 0.0 0%
richardh 7/10 4074 days true 0.0 0%
trvlbug 8/10 4102 days 0.0 0%
glennandjen 10/10 4163 days 0.0 0%
BryonyS 9/10 4181 days true 0.0 0%
Marion 9/10 4197 days true 0.0 0%
Mikey 7/10 4198 days true 0.0 0%
Richard Komzik 6/10 4199 days true 0.0 0%
Michael Walsall 10/10 4203 days 0.0 0%
Anna 8/10 4217 days true 0.0 0%
Abigail 7/10 4217 days true 0.0 0%
lannie 7/10 4226 days true 0.0 0%
SimonR 8/10 4227 days true 0.0 0%
SonjaG 7/10 4227 days true 0.0 0%
Chris 8/10 4233 days true 0.0 0%
AurelieD 8/10 4240 days true 0.0 0%
Yunker 10/10 4241 days true 0.0 0%
Andrew 8/10 4243 days true 0.0 0%
Erin 9/10 4243 days true 0.0 0%
Christopher Gallaga 8/10 4249 days 0.0 0%
Amy 10/10 4255 days true 0.0 0%
Shona 8/10 4255 days true 0.0 0%
plumbaum 9/10 4257 days true 0.0 0%
Sandra 10/10 4265 days true 0.0 0%
Evangelista 8/10 4265 days true 0.0 0%
Oliver 5/10 4267 days true 0.0 0%
Kat 9/10 4297 days true 0.0 0%
Lisa 8/10 4324 days true 0.0 0%
siobhan 8/10 4326 days true 0.0 0%
Alice 8/10 4326 days true 0.0 0%
NORTZ 7/10 4355 days 0.0 0%
Stefan 8/10 4357 days true 0.0 0%
Hugh Trenchard 9/10 4373 days 0.0 0%
Niamh 4/10 4379 days true 0.0 0%
Jenny 9/10 4403 days true 0.0 0%
Louise 8/10 4412 days true 0.0 0%
Peddy 10/10 4422 days 0.0 0%
Katie Wise 8/10 4425 days true 0.0 0%
Thomas Bachmann 8/10 4441 days true 0.0 0%
Daniala 8/10 4460 days true 0.0 0%
Tom Ben 9/10 4564 days true 0.0 0%
Sarah Maudsley 8/10 4579 days true 0.0 0%
Alan Bellerby 8/10 4579 days true 0.0 0%
Tina Daly 5/10 4585 days true 0.0 0%
John Woodrow 8/10 4594 days true 0.0 0%
Ernst Seter 9/10 4594 days true 0.0 0%
Jim Curley 7/10 4605 days true 0.0 0%
Daniel 7/10 4606 days true 0.0 0%
Marc Hertogs 7/10 4609 days true 0.0 0%
Laura Sutton 5/10 4633 days true 0.0 0%
Jeroen 5/10 4635 days true 0.0 0%
Mum! 6/10 4635 days true 0.0 0%
Gail 9/10 4639 days true 0.0 0%
Heike Julia 6/10 4640 days true 0.0 0%
Lanni 8/10 4640 days true 0.0 0%
Amanda Finger 7/10 4641 days true 0.0 0%
Desiree Muri 7/10 4641 days true 0.0 0%
Jan Grzejik 8/10 4668 days true 0.0 0%
Wouter Ewalts 8/10 4675 days true 0.0 0%
Matilde 6/10 4683 days true 0.0 0%
Kim 6/10 4880 days true 0.0 0%
Gillian 8/10 4922 days true 0.0 0%
Denise Nick 6/10 4932 days true 0.0 0%
ranker_110 8/10 4951 days true 0.0 0%
Jasper 7/10 4958 days true 0.0 0%
Mary 8/10 4958 days true 0.0 0%
Lucy 6/10 4958 days true 0.0 0%
Lukas 8/10 4969 days true 0.0 0%
Hanna 7/10 4971 days true 0.0 0%

Adjustments

Several adjustments to the weighted average are added to improve relevancy and credibility. These adjustments apply equally to all experiences that meet the criteria.

Sample Size Adjustment

No Adjustment

A reasonable number of reviews are necessary in order for the average to be credible and for an experience to take a prime position within the ranking tables. As such, experiences with only a few reviews have a moderated score. This does not mean that the experience or the reviews can't be trusted. The Waitomo Glowworm Caves experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-3.12% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 72 days. However the Waitomo Glowworm Caves experience does not meet the criteria for any adjustment.

In addition, an experience's ranking score may be adjusted for each day there is no new ranking. After 1 day the adjustment comes into effect. The maximum number of days that can be adjusted for is 200 days. Due to the seasonal nature of many businesses, this adjustment is applied dynamically throughout the year.

The Waitomo Glowworm Caves experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -3.07%
198 -3.09%
199 -3.10%
200 -3.12%
201 -3.13%
202 -3.15%
203 -3.16%

Final Ranking Score

72%

The final ranking score once adjustments and rounding has been applied. This value is cached and recalculated each day. Therefore it may not be precisely accurate based on the other values presented.

If you have any questions or comments about our ranking score calculation please get in touch at info@rankers.co.nz.